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before_add doesn't accept promise #273

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aizotov opened this issue Jan 9, 2020 · 0 comments

aizotov commented Jan 9, 2020 •

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This hinders our ability to validate the file. This PR seems to add this functionality #259 any chance you can revive it?

The use case is reading the file (using something like async FileReader) contents to verify the format, only uploading if the format is allowed.

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